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use super::CursorData;
use crate::{BufList, Cursor};
use std::{
io::{self, SeekFrom},
pin::Pin,
task::{Context, Poll},
};
use tokio::io::{AsyncBufRead, AsyncRead, AsyncSeek, ReadBuf};
impl<T: AsRef<BufList> + Unpin> AsyncSeek for Cursor<T> {
fn start_seek(mut self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> {
io::Seek::seek(&mut *self, pos).map(drop)
}
fn poll_complete(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<u64>> {
Poll::Ready(Ok(self.get_mut().position()))
}
}
impl<T: AsRef<BufList> + Unpin> AsyncRead for Cursor<T> {
fn poll_read(
mut self: Pin<&mut Self>,
_: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
let this = &mut *self;
this.data.tokio_poll_read_impl(this.inner.as_ref(), buf)
}
}
impl<T: AsRef<BufList> + Unpin> AsyncBufRead for Cursor<T> {
fn poll_fill_buf(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
Poll::Ready(io::BufRead::fill_buf(self.get_mut()))
}
fn consume(mut self: Pin<&mut Self>, amt: usize) {
io::BufRead::consume(&mut *self, amt)
}
}
impl CursorData {
fn tokio_poll_read_impl(
&mut self,
list: &BufList,
buf: &mut ReadBuf<'_>,
) -> Poll<io::Result<()>> {
while buf.remaining() > 0 {
let (chunk, chunk_pos) = match self.get_chunk_and_pos(list) {
Some(value) => value,
None => break,
};
let n_to_copy = (chunk.len() - chunk_pos).min(buf.remaining());
let chunk_bytes = chunk.as_ref();
let bytes_to_copy = &chunk_bytes[chunk_pos..(chunk_pos + n_to_copy)];
buf.put_slice(bytes_to_copy);
self.pos += n_to_copy as u64;
if n_to_copy == chunk.len() - chunk_pos {
self.chunk += 1;
}
}
Poll::Ready(Ok(()))
}
}